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<div class="titlepage"><div><div><h4 class="title">
<a name="spirit.karma.quick_reference.semantic_actions"></a><a class="link" href="semantic_actions.html" title="Generator Semantic Actions">Generator
        Semantic Actions</a>
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<p>
          Semantic Actions may be attached to any generator as follows:
        </p>
<pre class="programlisting"><span class="identifier">g</span><span class="special">[</span><span class="identifier">f</span><span class="special">]</span>
</pre>
<p>
          where <code class="computeroutput"><span class="identifier">f</span></code> is a function with
          the signatures:
        </p>
<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">Attrib</span><span class="special">&amp;);</span>
<span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">Attrib</span><span class="special">&amp;,</span> <span class="identifier">Context</span><span class="special">&amp;);</span>
<span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">Attrib</span><span class="special">&amp;,</span> <span class="identifier">Context</span><span class="special">&amp;,</span> <span class="keyword">bool</span><span class="special">&amp;);</span>
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<p>
          You can use <a href="../../../../../../../libs/bind/index.html" target="_top">Boost.Bind</a>
          to bind member functions. For function objects, the allowed signatures
          are:
        </p>
<pre class="programlisting"><span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Attrib</span><span class="special">&amp;,</span> <span class="identifier">unused_type</span><span class="special">,</span> <span class="identifier">unused_type</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Attrib</span><span class="special">&amp;,</span> <span class="identifier">Context</span><span class="special">&amp;,</span> <span class="identifier">unused_type</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Attrib</span><span class="special">&amp;,</span> <span class="identifier">Context</span><span class="special">&amp;,</span> <span class="keyword">bool</span><span class="special">&amp;)</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
          The <code class="computeroutput"><span class="identifier">unused_type</span></code> is used
          in the signatures above to signify 'don't care'.
        </p>
<p>
          For more information see <a class="link" href="../tutorials/semantic_actions.html" title="Generator Semantic Actions">Semantic
          Actions</a>.
        </p>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2011 Joel de Guzman, Hartmut Kaiser<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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